{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical", "Disease"], "input": "In Japan , a nationwide prevention program against mother - to - infant infection by hepatitis B virus ( HBV ) started in 1985 ."}
{"Chemical": [], "Disease": ["infection by hepatitis B virus"]}